I'm having the exact same problem right now setting up my template.  I'm using Sib 7.5.1, Kontakt 4.2.4, VDL 2.5.5.  I'm operating on a Mac OS 10.7.5.  My desktop allowed me to set the playback configuration but won't allow me to open the template VDL 7.0a, it crashes every single time. My laptop won't allow me to save the playback configuration, it crashes every time I try to save the configuration.  Famithmusic, I don't know if you reinstalled Sibelius, VDL, the template? Hugh I'm hoping I don't have to re-install everything and try again.  If there is any help either of you can give, I'd greatly appreciate it.  Thanks in advance.
Jeremy